MX Record Resolver Component (ActiveX) 

Retrieve MX records of any domain name. It only uses windows sockets.
mx record resolver component activex

DNS Watcher 

DNS Watcher is a program designed to monitor and query DNS servers. DNS Watcher is mainly intended for use by webmasters and website operators to keep watch on their DNS entries and make sure the name servers are responding correctly.
dns name server dns records monitor dns dns monitoring

Essential NetTools 

Essential NetTools is a useful tool for diagnosing networks and monitoring your computer's network connections. It's a Swiss Army knife for everyone interested in a set of powerful network tools for everyday use.
network monitoring netstat ping traceroute ip portscan snmp audit utility

Interactive DNS Query 

Interactive DNS Query is a program designed to allow you to perform a query of DNS records. It is similar to the unix "dig" or "nslookup" commands, and uses a convenient GUI interface. Query for all types of DNS records, include A, MX, TXT, NS, ...
dns dig dns lookup dns query